EP 0056090 B1 19840404 - METHOD OF DEWATERING SLUDGES CONTAINING MINERAL OILS WITH RECOVERY OF THE OIL FRACTION
Title (en)
METHOD OF DEWATERING SLUDGES CONTAINING MINERAL OILS WITH RECOVERY OF THE OIL FRACTION
Publication
Application
Priority
DE 3100899 A 19810114
Abstract (en)
[origin: US4417976A] A process for dewatering petroleum-containing sludges by a two-stage method using finely divided additives and organic flocculants, wherein (a) finely divided additives, such as ash, coal, sand or mixtures of these, in a free-flowing form or as an aqueous suspension, are homogeneously dispersed in the petroleum-containing sludge, in an amount such that the total solids content of the resulting mixture is from 10 to 30% by weight, especially from 12 to 20% by weight, (b) this sludge mixture is treated with an aqueous solution of an organic flocculant, preferably of anionic nature, (c) the greater part of the sludge water is removed by gravity filtration, (d) the pre-dewatered sludge mixture is treated with an aqueous solution of aluminum salts or trivalent iron salts and (e) this mixture is substantially dewatered by pressure filtration, in the course of which the greater part of the petroleum present is also removed.
IPC 1-7
IPC 8 full level
B01D 17/00 (2006.01); B01D 37/00 (2006.01); C02F 11/12 (2019.01); C10G 33/00 (2006.01); C10G 33/04 (2006.01)
CPC (source: EP US)
B01D 17/00 (2013.01 - EP US); B01D 17/047 (2013.01 - EP); B01D 17/08 (2013.01 - EP); B01D 37/00 (2013.01 - EP US); B01D 37/03 (2013.01 - EP); C02F 11/12 (2013.01 - EP US); C10G 33/04 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0056090 A1 19820721; EP 0056090 B1 19840404; AT E6927 T1 19840415; CA 1182418 A 19850212; DE 3100899 A1 19820805; DE 3162987 D1 19840510; JP S57141491 A 19820901; US 4417976 A 19831129
DOCDB simple family (application)
EP 81108839 A 19811024; AT 81108839 T 19811024; CA 393511 A 19820104; DE 3100899 A 19810114; DE 3162987 T 19811024; JP 292682 A 19820113; US 33341681 A 19811222